Actions: Use global.json

Author: Sebazzz

.github/workflows/continuous-integration-workflow.yml

@@ -25,7 +25,7 @@ jobs:
             - name: Install .NET 8.x SDK for build
               uses: actions/setup-dotnet@v2
               with:
-                  dotnet-version: '8.0.100'
+                  global-json-file: global.json
 
             - name: Output important software versions (node)
               run: node --version

.github/workflows/publish-nightly-build.yml

@@ -25,7 +25,7 @@ jobs:
             - name: Install .NET 8.x SDK for build
               uses: actions/setup-dotnet@v2
               with:
-                  dotnet-version: '8.0.100'
+                  global-json-file: global.json
 
             - name: Restore .NET Core tools
               run: dotnet tool restore